Altaic etymology :

Comments:EAS 51, Poppe 22, 79. A Western isogloss. The Jpn. reflex could have merged with *či̯úŕu q. v. TM *daran can be borrowed < Mong. (see Doerfer MT 73), but *dā- (with preservation of length in a monosyllabic stem after the loss of -r-) is certainly genuine.